From 0185408126529d5df7e095c5789affd4ae971375 Mon Sep 17 00:00:00 2001
From: Bo Xu <bo_xu@foxitsoftware.com>
Date: Wed, 21 Jan 2015 12:17:23 -0800
Subject: Simplify UTF16LE_Encode and add unittest.

Previously, UTF16LE_Encode take an optional flag to indicate
if the returned byte string has trailing zeros. In fact, no where
needs the flag to be false. So just get rid of it so callers won't
misuse.

The bug is found by https://codereview.chromium.org/837723009

R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/860973002
---
 core/include/fxcrt/fx_string.h               |  2 +-
 core/src/fxcrt/fx_basic_wstring.cpp          | 16 ++++++---------
 core/src/fxcrt/fx_basic_wstring_unittest.cpp | 29 ++++++++++++++++++++++++++++
 3 files changed, 36 insertions(+), 11 deletions(-)
 create mode 100644 core/src/fxcrt/fx_basic_wstring_unittest.cpp

(limited to 'core')

diff --git a/core/include/fxcrt/fx_string.h b/core/include/fxcrt/fx_string.h
index eae1c15a04..33634f8379 100644
--- a/core/include/fxcrt/fx_string.h
+++ b/core/include/fxcrt/fx_string.h
@@ -774,7 +774,7 @@ public:
 
     CFX_ByteString			UTF8Encode() const;
 
-    CFX_ByteString			UTF16LE_Encode(FX_BOOL bTerminate = TRUE) const;
+    CFX_ByteString			UTF16LE_Encode() const;
 
     void					ConvertFrom(const CFX_ByteString& str, CFX_CharMap* pCharMap = NULL);
 protected:
diff --git a/core/src/fxcrt/fx_basic_wstring.cpp b/core/src/fxcrt/fx_basic_wstring.cpp
index 0827fb6f34..0945d2f1c5 100644
--- a/core/src/fxcrt/fx_basic_wstring.cpp
+++ b/core/src/fxcrt/fx_basic_wstring.cpp
@@ -323,25 +323,21 @@ CFX_ByteString CFX_WideString::UTF8Encode() const
 {
     return FX_UTF8Encode(*this);
 }
-CFX_ByteString CFX_WideString::UTF16LE_Encode(FX_BOOL bTerminate) const
+CFX_ByteString CFX_WideString::UTF16LE_Encode() const
 {
     if (m_pData == NULL) {
-        return bTerminate ? CFX_ByteString(FX_BSTRC("\0\0")) : CFX_ByteString();
+        return CFX_ByteString(FX_BSTRC("\0\0"));
     }
     int len = m_pData->m_nDataLength;
     CFX_ByteString result;
-    FX_LPSTR buffer = result.GetBuffer(len * 2 + (bTerminate ? 2 : 0));
+    FX_LPSTR buffer = result.GetBuffer(len * 2 + 2);
     for (int i = 0; i < len; i ++) {
         buffer[i * 2] = m_pData->m_String[i] & 0xff;
         buffer[i * 2 + 1] = m_pData->m_String[i] >> 8;
     }
-    if (bTerminate) {
-        buffer[len * 2] = 0;
-        buffer[len * 2 + 1] = 0;
-        result.ReleaseBuffer(len * 2 + 2);
-    } else {
-        result.ReleaseBuffer(len * 2);
-    }
+    buffer[len * 2] = 0;
+    buffer[len * 2 + 1] = 0;
+    result.ReleaseBuffer(len * 2 + 2);
     return result;
 }
 void CFX_WideString::ConvertFrom(const CFX_ByteString& str, CFX_CharMap* pCharMap)
diff --git a/core/src/fxcrt/fx_basic_wstring_unittest.cpp b/core/src/fxcrt/fx_basic_wstring_unittest.cpp
new file mode 100644
index 0000000000..c6e5c2f3d0
--- /dev/null
+++ b/core/src/fxcrt/fx_basic_wstring_unittest.cpp
@@ -0,0 +1,29 @@
+// Copyright 2014 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "../../../testing/fx_string_testhelpers.h"
+#include "../../include/fxcrt/fx_basic.h"
+
+#define ByteStringLiteral(str) CFX_ByteString(FX_BSTRC(str))
+
+TEST(fxcrt, WideStringUTF16LE_Encode) {
+  struct UTF16LEEncodeCase {
+    CFX_WideString ws;
+    CFX_ByteString bs;
+  } utf16le_encode_cases[] = {
+    { L"", ByteStringLiteral("\0\0") },
+    { L"abc", ByteStringLiteral("a\0b\0c\0\0\0") },
+    { L"abcdef", ByteStringLiteral("a\0b\0c\0d\0e\0f\0\0\0") },
+    { L"abc\0def", ByteStringLiteral("a\0b\0c\0\0\0") },
+    { L"\xaabb\xccdd", ByteStringLiteral("\xbb\xaa\xdd\xcc\0\0") },
+    { L"\x3132\x6162", ByteStringLiteral("\x32\x31\x62\x61\0\0") },
+  };
+
+  for (size_t i = 0; i < FX_ArraySize(utf16le_encode_cases); ++i) {
+    EXPECT_EQ(utf16le_encode_cases[i].bs,
+        utf16le_encode_cases[i].ws.UTF16LE_Encode())
+        << " for case number " << i;
+  }
+}
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